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1、Xxxxxxx毕业设计(论文)2FSK数字调制通信系统的设计摘要调制解调器是通信系统中的关键设备,其性能的好坏直接关系到整个系统的性能。本次设计的FSK调制系统具有抗干扰、抗噪声、抗衰减性能较强、技术复杂程度比较低、成本低等诸多优点,因而广泛应用与实际电路中。在中低速数据传输通信系统中得到了较为广泛的应用。此外,许多集成芯片里也用到了FSK调制技术。本次设计的FSK电路可广泛用于计算机网络、办公自动化、远程自控系统及移频通信中。现代通信系统要求通信距离远、通信容量大、传输质量好。作为其关键技术之一的调制解调技术一直是人们研究的一个重要方向。从最早的模拟调幅
2、调频技术的日臻完善,到现在数字调制技术的广泛运用,使得信息的传输更为有效和可靠.。采用FSK调制方式的主要优点是:①无需载波恢复,大大降低了系统复杂度。②对幅度的非线性抗干扰能力强。因为FSK信号为恒包络信号,其信息完全包含在信号的过零点上,所以比起调幅信号,其对幅度非线性抗干扰能力要强。③调制解调易用软硬件实现,简单易懂。关键字:VHDL语言;2FSK调制;2FSK解调;MFSK调制第41页共42页Xxxxxxx毕业设计(论文)2FSKDigitalmodemsCommunicationSystemDesignSummary Modemisthekeye
3、quipmentofcommunicationssystem;itsperformancewillhaveadirecteffectontheperformanceofthewholesystem.ThedesignoftheFSKmodulationsystemhasadvantagessuchasanti-jamming,anti-noise,high-attenuationperformance,relativelylowtechnicalcomplexityandlowcost,thuswidelyapplyinginactualcircuit.I
4、thasbeenmorewidelyusedinthelow-speeddatatransmissioncommunicationsystem.Inaddition,manyintegratedchipalsousedtheFSKmodulationtechnique.ThedesignoftheFSKcircuitcanbewidelyusedincomputernetworking,officeautomation,remote-controlledsystemandthefrequencyshiftincommunication.Moderncomm
5、unicationsystemsrequirefardistancecommunications,telecommunicationscapacity,andtransmissionquality.Asoneofthekeytechnologiesofitsmodemtechnologyhasalwaysbeenanimportantresearchingdirectionofpeople.FromtheearliestAMFManalogtechnologyimproving,andnowdigitalmodulationoftheextensiveus
6、eoftechnology,makingthetransmissionofinformationmoreeffectiveandreliable.ThemainadvantagesofusingFSKmodulationare:①withoutcarrierrecovery,significantlyreducingsystemcomplexity.②stronganti-interferencecapabilityontherateofnon-linear.BecausetheFSKsignalsareconstantenvelopesignals,th
7、einformationaretotallyincludedintheover0.1signalpoint,ratherthanAMsignals,havingstrongeranti-interferencecapabilityontherateofnon-linear.③modemiseasytoachievebyusingsoftwareandeasy-to-understand.Keyword:VHDLLanguage;The2FSKmake;The2FSKsolutionadjust;TheMFSKmake第41页共42页Xxxxxxx毕业设计(
8、论文)绪论如今社会通信技术的发展速度可谓日新月异,计算机的出现在现